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Direct Definition: A bottleneck (or operational constraint) is a stage in a production process that has the lowest effective capacity or slowest throughput rate. It determines the maximum output speed of the entire manufacturing facility, as downstream stations can only produce as fast as the bottleneck feeds them.
In manufacturing, a bottleneck dictates the maximum revenue potential of your facility. Based on the Theory of Constraints (TOC), an hour lost on a bottleneck machine is an hour lost for the entire business.
How to Identify a Bottleneck
On the shop floor, bottlenecks can be recognized through several visual signals:
- Inventory Piles: Large stacks of work-in-progress (WIP) waiting directly in front of a specific machine.
- Starved Downstream Stations: Operators downstream waiting idle for parts to arrive from the bottleneck cell.
- Constant Overtime: A specific department regularly requiring overtime to keep up with standard order volumes.
Managing and Protecting the Bottleneck
To maximise total output, schedulers must ensure the bottleneck machine never sits idle waiting for raw materials, operator breaks, or tooling setups. Visual scheduling software helps protect the bottleneck by sequencing jobs with matching setups and warning managers when queues become overloaded.
Frequently Asked Questions
- What is a bottleneck in a factory?
- A bottleneck is the slowest machine or process step that limits the overall production capacity of the entire workshop.
- How do you fix a bottleneck?
- You can reduce bottleneck impact by optimising tooling changeovers, offloading non-critical tasks to other machines, or adding secondary shifts.
- Why is protecting the bottleneck crucial?
- Because any idle minute on a bottleneck machine permanently reduces the total finished output and revenue of the entire factory.